In the latest incarnation of Win10, the old way of quickly viewing your startup time and possible issues is gone.
Press the Windows + R keys and type eventvwr then press Enter.
Event viewer > Application and Service logs > Microsoft > Windows > Diagnostics-Performance > Operational
This used to measure both Boot and Shutdown times. Boot Performance Monitoring, which was still there as of v2004 has been eliminated.
Now we are left with this: Task Manager / Startup (press the Ctrl + Shift + Esc keys > Startup tab)
Wow! What a load of… useful information! 😉
Like several other things in 20H2, this is clearly broken.